<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!--style标签专门用来定义css样式代码-->
    <style type="text/css">
        /* 需求1：分别定义两个 div、span标签，分别修改每个 div 标签的样式为：边框1个像素，实线，红色。*/
        div{
            border: 1px solid red;
        }
        span{
            border: 1px solid red;
        }
    </style>
</head>

<body>
    <div>div标签1</div>
    <div>div标签2</div>

    <span>span标签1</span>
    <span>span标签2</span>
</body>
</html>